Math Is Fun Forum

finitehelp

Member

Registered: 2009-06-21

Posts: 80

hardest probability ever ...please help

1.determine whether or not the given procedure results in a binomial distribution. For those that are not bi-nomial, identify at least one requirement that is not satisfied.Treating 152 couples with the YSORT gender selection method devel-oped by the Genetics & IVF Institute and recording the gender of each of the 152 babies that are born.

10. Assume that a procedure yields a binomial distribution with n trials and the probability of success for one trial is p. Use the given values of n and p to find the mean and standard devi-ation Also, use the range rule of thumb to find the minimum usual value. The final exam in a sociology course consists of 100 multiple- choice questions. Each question has 5 possible answers, and only 1 of them is correct. An unprepared student makes random guesses for all of the answers.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: hardest probability ever ...please help

Hi;

I am not sure that I understand your questions. I will give you the standard answer for this type of problem:

The final exam in a sociology course consists of 100 multiple- choice questions. Each question has 5 possible answers, and only 1 of them is correct. An unprepared student makes random guesses for all of the answers.

The expected number of right answers or the mean  is n * p

The standard deviation is:

What else do you need?

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